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      The role of iron in sulfide induced corrosion of sewer concrete.

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          Abstract

          The sulfide-induced corrosion of concrete sewer is a widespread and expensive problem for water utilities worldwide. Fundamental knowledge of the initiation and propagation of sewer corrosion, especially the interactions between chemical reactions and physical structure changes, is still largely unknown. Advanced mineral analytical techniques were applied to identify the distribution of corrosion products and the micro-cracking that developed along the corrosion boundary. It was found that sewer concrete corrosion caused by reactions with sulfuric acid progressed uniformly in the cement of concrete. In contrast to conventional knowledge, iron rust rather than gypsum and ettringite was likely the factor responsible for cracking ahead of the corrosion front. The analysis also allowed quantitative determination of the major corrosion products, i.e., gypsum and ettringite, with the latter found closer to the corrosion front. The conceptual model based on these findings clearly demonstrated the complex interactions among different chemical reactions, diffusion, and micro-structure changes.

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          Author and article information

          Journal
          Water Res.
          Water research
          Elsevier BV
          1879-2448
          0043-1354
          Feb 01 2014
          : 49
          Affiliations
          [1 ] Advanced Water Management Centre, The University of Queensland, St. Lucia, QLD 4072, Australia.
          [2 ] Sustainable Minerals Institute, Julius Kruttschnitt Mineral Research Centre, The University of Queensland, Indooroopilly, QLD 4068, Australia.
          [3 ] Advanced Water Management Centre, The University of Queensland, St. Lucia, QLD 4072, Australia. Electronic address: j.keller@awmc.uq.edu.au.
          Article
          S0043-1354(13)00918-4
          10.1016/j.watres.2013.11.007
          24326021
          0c71e59d-1213-4804-bf4f-e2c999584d8d
          History

          Iron,Mineral liberation analysis,Sewer,Corrosion,Cracking,Hydrogen sulfide

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